Transmit Power Minimization and Base Station Planning for High-Speed Trains with Multiple Moving Relays in OFDMA Systems
| Autor: | Hakim Ghazzai, Mohamed-Slim Alouini, Tareq Y. Al-Naffouri, Taha Bouchoucha, Elias Yaacoub, Ahmad Alsharoa |
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| Rok vydání: | 2016 |
| Předmět: |
Engineering
Computer Networks and Communications Real-time computing Aerospace Engineering Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology law.invention Base station 0203 mechanical engineering Hungarian algorithm Relay law Telecommunications link 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Frequency-division multiple access business.industry ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS 020206 networking & telecommunications 020302 automobile design & engineering Transmitter power output Handover Automotive Engineering Resource allocation business Computer network |
| Zdroj: | IEEE Transactions on Vehicular Technology. :1-1 |
| ISSN: | 1939-9359 0018-9545 |
| DOI: | 10.1109/tvt.2016.2542344 |
| Popis: | A high-speed railway system equipped with moving relay stations placed on the middle of the ceiling of each train wagon is investigated. The users inside the train are served in two hops via orthogonal frequency-division multiple-access (OFDMA) technology. In this paper, we first focus on minimizing the total downlink power consumption of the base station (BS) and the moving relays while respecting specific quality-of-service (QoS) constraints. We first derive the optimal resource-allocation solution, in terms of OFDMA subcarriers and power allocation, using the dual decomposition method. Then, we propose an efficient algorithm based on the Hungarian method to find a suboptimal but low-complexity solution. Moreover, we propose an OFDMA planning solution for high-speed trains by finding the maximal inter-BS distance, given the required user data rates to perform seamless handover. Our simulation results illustrate the performance of the proposed resource-allocation schemes in the case of Third-Generation Partnership Project (3GPP) Long-Term Evolution Advanced (LTE-A) and compare them with previously developed algorithms, as well as with the direct transmission scenario. Our results also highlight the significant planning gain obtained, owing to the use of multiple relays instead of the conventional single-relay scenario. |
| Databáze: | OpenAIRE |
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